Audax67 wrote:Mick F wrote:Beat me to it!
Yes, it's circumference for (modern metric) hat sizing.
I prefer the Imperial way of diameter. I've a small head ind it's size 63/4", where most men have 67/8".
Yebbut the UK measurement assumes that your head is perfectly circular. This is daft because UKsians are predominantly long-headed front to back.
https://en.wikipedia.org/wiki/Cephalic_ ... ex_map.jpg
Yes, The origin of the helmet specifications, peddled by Darwin, finally comes in fruition.
Evidence of natural selection and the evolutionary shape-shifting of the Great British bonce since the Victorian era
After 180 years of human powered cycling machines, the skulls of British cyclists have become... aerodynamically streamlined!
Explains the cluster of recent British Tour de France wins